Internal-combustion engine



Sept. 9 1924.

A. A. LOETSCHE R INTERNAL COMBUSTION ENGINE Filed Sept. 13, 1922 INVENTOR AA Loelscber,

aromas WITNESSES Patented Sept. 9, 1924.

ALVIN A. nonrsonnn,

INTERNAL-COMBUSTION ENGINE.

PATENT mice;

or CHICAGO, ILLINOIS;

Application filed September 13, 1922. Serial No. 587,951. v

To (ZZZ whom it may concern:

Be it known that I, ALVIN A. LOETSOHER, a citizen of the United States, and a, resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Internal-Combustion Engines, of which the followingis a specification. A

This invention relates to charge forming devices for internal combustion engines, and more particularly to charge forming devices providing for automatic dilution of the charge at high engine speeds.

The object of the invention is to provide a charge forming device of this character which maintains the charge or combustible mixture of proper composition at all engine speeds, the device providing for an additional supply of air at high engine speeds so as to compensate for the increased supply'of hydrocarbon due to the greater suction effect produced by the morerapid fiow of air through the carbureter and thereby reducing the proportion of-the hydrocarbon in the mixture which would otherwise be richer in hydrocarbon than is desirable.

Another object is to provide a device of this character which is controlled by the flow of gases making up the mixture from the carbureter to the cylinders of the engine so that the admission of additional air followsimmediately upon theincrease in the rate of flow of these gases and also that the additional supply of air is' cut offimmedi ately upon the decrease of the rateof flow of these gases, undesirable lagging in the admission or cutoff being in this manner precluded. 0 her objects and advantages ofthe invention reside in certain novel features of the construction, combination and arrangement of parts which will be hereinafter more fully described and particularly pointed out in the appended claims, reference being had to the accompanying drawings forming part of this specification, and in which: I

Figure 1 is a View in elevation, showing the invention associated with the carbureter and intake manifold of an internal combustion engine;

Figure 2 is a plan view, showing the gasket in which the invention is embodied,-

parts being broken away and shown in section for the sake of illustration;

Figure 3 is anview in side elevation of the device shown in Figure 2; and c Figure 4 is a diagrammatic view in per.-

, spect-ive showing the parts of the invention disassociated from the gasket and from the elements of the engine;

Referring to the drawings wherein-for the sake of illustration is shownthefpreferred embodiment of the invention, the numeral 10 designates the carburetervof an is as usual provided with a coupling flange 11, the coupling flange 11 being ordinarily adapted 'to cooperate with. the coupling flange l2 formed'on one end :of theointake manifold 13 for connecting thecarbureter and the manifold,-it is to be understood of course that, the manifold communicates in the usual manner with the cylinders. of, the engine: H ;v i In the present embodiment of the-invention a relatively heavy and thick gasket-15 is interposed between the coupling flanges '11 and. 12 of the carbureter and manifold is journaled, the rock shaft. being held from I accidentaldisplacement by pins 20' or other suitable means. WVithin the gasket and consequently withinthe conduit which extends from the carbureter to the cylinders of the engine and tlirougliwhich the gasvis mak- 21 is arrangedand is rigidly connected to the rock shaft 19. The vane 21 is disposed to lie across the path of the gases in such manner that the gases tend to turn the vane 21. As the vane 21 is fixedto the shaft 19, this shaft 19 also tends to turn but at low engine speeds, such turning movement is prevented by virtue of the action of the retractile coil spring 22. As shown in the drawing one end of this retractile coil spring 22 is connected to an adjusting screw 23 opinternal combustion engine. The carbureter,

ing up the combustible mixture flow, a. vane eratively mounted in a post 24E upstanding from the gasket, the adjusting screw being held in adjusted position by means of a nut 25 threaded thereon and engageable with the post 24. The end. of the retractile coil spring 22 opposite to that which engages the screw 23 is connected to one end of a pin 26 which is fitted in a diametrical opening provided in the shaft 20 and suitably se cured to this shaft. Both ends of the pin '26 project beyond the shaft and the end of the pin opposite to that which is secured to the spring 22 is suitably connected to one end of a link27, the opposite end of which link is suitably connected to an arm 28 rigidly connected with a butterfly valve 29 pivotally mounted by means of trunnions 30 in an auxiliary air inlet port 31 provided in a gasket 15.

In operation the arrangement is such that at low engine speeds the butterfly valve 29 will remain closed and prevent inflow of air through the port 31, this valve being held closed by virtue of the action of the spring '22 which prevents the gases flowing from the carbureter to the engine and striking the vane 21 from turning the vane 21 and the shaft 19 upon which the vane 21 is mounted and thereby opening the butterfly valve 29. As the speed of the engine increases, however, the force with which the gases impinge against the vane 21 greatly increases and ultimately becomes so great as to turn the vane and shaft 19 against the tension of the spring 22. This motion of the shaft 19 is transmitted to the valve 29 through the pin 26, link 27 and arm 28 and results in the opening of this valve and in 'tlie inflow of air through theport 31. It is to be understood that the connections between the link 27 and the pin 26 and arm 28 maybe either pivotal, universal or pin and slot as may be requisitefor etficiently transmitting the motion. The point at which the, shaft 19 is turned and consequently the point'at which air is admitted through the port 31 may be conveniently regulated by adjusting the screw 23 and thereby varying the tension of the shaft 22.

Itis to be understood thatthe invention in its broadest aspects consists in the provision of an auxiliary air inlet regulated by a valve, the valve in turn being controlled by a vane or other means acting under the influence of the gases flowing from the carbureter of the engine. The particular means for transmitting the motion from the vane to the valve may of course be varied dependent upon the requirements of different internal combustion engines. In addition to these broad features of the invention an important feature resides in the control of the vanes by the spring 22 and in the adjustment of this spring for de termining the point at which the auxiliary air is to be admitted as Well as in the organization of the device in a gasket.

*I claim:

1. In a charge forming device for internal combustion engines having a carbureter and an intake manifold, a gasket interposed between the carbureter and the intake manifold and having an auxiliary air inlet opening provided therein, a valve controlling the flow of air through said opening, a rock shaft rotatably mounted in the gasket and extending transversely thereacross, a vane rigidly connected with the rock shaftwithin the gasket and disposed to be actuated by the gases flowing to the carbureter to the engine at high engine speeds, motion transmlsslon means between the rock shaft and the valve, and spring means for lnfiuenclng the rock shaft to such position as to maintain the valve closed at low engine speeds, the vane being adapted to be actuated by the flowing gases at high engine speeds to open the valve against the tension of said spring.

2. In a charge forming device forinternal combustion engines having a carbureter and an intake manifold, a gasket interposed between the carbureter and the intake manifold and having an auxiliary air inlet provided therein, a butterfly valve having trunnions pivotally mounted in the wall of the inlet opening and controlling the flow of air through said opening, a rock shaft rotatably mounted in the gasket and extending transversely thereacross, a vane rigidly connected with the rock shaft within the gasket and disposedto be operated upon and influenced b 7 the ases flowin throu h b b b the manifold, said rock shaft having a diametric opening, a pin secured in said diametric opening and projecting at itsends beyond the rock shaft, a spring having one of its ends connected to one end of the pin, a post carried by the gasket, an adjusting screw mounted on the post and engaging the end of the spring opposite to that which is connected to the pin, a link 'pivotally connected to the end of the pin opposite to that connected to the spring, said'butterfly valve having an arm pivotally connected to the link.

ALVIN A. Lon'rsonnn. 

